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Supplementation of protease and different nutrient density diets in growing-finishing pigs
Sehyun Park,Ji Hwan Lee,Won Yun,홍석만,오한진,송동철,장세연,Jae Woo An,조현아,Kyeongho Jeon,Jin Ho Cho 한국축산학회 2024 한국축산학회지 Vol.66 No.2
This study was conducted to investigate the effects of protease supplementation and different nutrient density of diets in growing-finishing pigs. A total of one hundred-eight crossbred growing pigs ([Landrace × Yorkshire] × Duroc) with an initial body weight (BW; 18.74 ± 3.46 kg) were used for 15 weeks. Pigs were randomly assigned to six dietary treatments with 6 replicates of 3 pigs per pen in a 3 × 2 factorial through the following arrangement: Three groups of protease (1, Basal diets; 2, Protease A: 125 mg/kg protease derived from Streptomyces sps; 3, Protease B: 100 mg/kg protease derived from Bacillus licheniformis) at two different nutrient density diets (1, Basal requirement; 2, 0.94%–0.98% higher than requirement in dietary protein and 50 kcal/kg in energy). High nutrient (HN) diets showed higher average daily gain (ADG) (p < 0.05) and apparent total tract digestibility (ATTD) of crude protein (CP) (p < .0001) compared to basal nutrient (BN) diets during growing periods. Supplementation of protease showed higher BW (p < 0.05) and ADG (p < 0.05) compared to non-supplementation of protease during growing periods. Also, supplementation of protease showed higher ATTD of CP (p < 0.01), ATTD of gross energy (p < 0.05) and decreased blood urea nitrogen (BUN) level (p = 0.001) compared to non-supplementation of protease during finishing periods. Pigs which fed the protease showed decreased ammonia (NH3) emissions (p < 0.05) during experiment periods and decreased hydrogen sulfide (H2S) emissions (p < 0.01) during finishing periods. Interactions between nutrient density and protease were observed, which decreased the feed conversion ratio (p < 0.05) in HN diets without protease compared to BN diets without protease during weeks 4 to 6. Also, interaction between nutrient density and protease was observed, which resulted in improved ATTD of CP (p < 0.01) in response to PTA supplementation with HN diets during the finishing period. In conclusion, supplementation of protease reduces NH3 in feces and BUN in whole blood by increasing the digestibility of CP and improves growth performance. Also, diets with high nutrient density improved growth performance and nutrient digestibility in growing periods.
Park, Sanguk,Kang, Byeongkwan,Choi, Myeong-in,Jeon, Seonki,Park, Sehyun Elsevier 2018 Sustainable cities and society Vol.39 No.-
<P><B>Abstract</B></P> <P>Currently, many researchers worldwide are focusing on creating a novel service model by integrating IoT (Internet of Things) technologies with ICT (Information and Communications Technologies) to increase energy efficiency by reducing power consumption and greenhouse gas emissions. This paper examines the problems related to the current integrated ESS (Energy Storage System) in a smart grid: high installation costs and low management efficiency. To solve these problems, this paper studies the development of a micro-distributed ESS in an intelligent LED (Light Emitting Diode) streetlight system, and its low-cost installation and high management efficiency in a micro grid. Through the application of this system, the initial installation costs can be reduced by using micro-distributed ESS and IoT-based intelligent energy management, facilitating power monitoring of the streetlights and energy efficient demand resource management in the micro grid. This provides a more intelligent and efficient environment, such as in a smart-city.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This system is sufficient for providing alternative power using intelligent power peaks and demand resource management. </LI> <LI> These functions include power demand management, power stabilization, alternative power, and energy conservation. </LI> <LI> The LED system has advantages from the viewpoint of energy efficiency and service at the same time. </LI> <LI> In the future, this system can provide intelligent energy IoT services in cities for sustainability. </LI> <LI> This system can extend the core service technology in various fields such as the power demand management business. </LI> </UL> </P>
Observational evidence for the formation of DMS-derived aerosols during Arctic phytoplankton blooms
Park, Ki-Tae,Jang, Sehyun,Lee, Kitack,Yoon, Young Jun,Kim, Min-Seob,Park, Kihong,Cho, Hee-Joo,Kang, Jung-Ho,Udisti, Roberto,Lee, Bang-Yong,Shin, Kyung-Hoon Copernicus GmbH 2017 Atmospheric chemistry and physics Vol.17 No.15
<P>Abstract. The connection between marine biogenic dimethyl sulfide (DMS) and the formation of aerosol particles in the Arctic atmosphere was evaluated by analyzing atmospheric DMS mixing ratio, aerosol particle size distribution and aerosol chemical composition data that were concurrently collected at Ny-Ålesund, Svalbard (78.5° N, 11.8° E), during April and May 2015. Measurements of aerosol sulfur (S) compounds showed distinct patterns during periods of Arctic haze (April) and phytoplankton blooms (May). Specifically, during the phytoplankton bloom period the contribution of DMS-derived SO42− to the total aerosol SO42− increased by 7-fold compared with that during the proceeding Arctic haze period, and accounted for up to 70 % of fine SO42− particles (< 2.5 µm in diameter). The results also showed that the formation of submicron SO42− aerosols was significantly associated with an increase in the atmospheric DMS mixing ratio. More importantly, two independent estimates of the formation of DMS-derived SO42− aerosols, calculated using the stable S-isotope ratio and the non-sea-salt SO42− ∕ methanesulfonic acid ratio, respectively, were in close agreement, providing compelling evidence that the contribution of biogenic DMS to the formation of aerosol particles was substantial during the Arctic phytoplankton bloom period. </P>
Park, Sehyun,Joo, Jung Min,Cho, Eun Jin WILEY‐VCH Verlag 2015 EUROPEAN JOURNAL OF ORGANIC CHEMISTRY Vol.2015 No.19
<P><B>Abstract</B></P><P>Regioselective trifluoromethylation at a remote position represents an important challenge in the development of biologically active molecules and functional materials. A practical method to access β‐trifluoromethyl ketones from readily available propargylic alcohols by visible light photocatalysis has been developed. Trifluoromethylation of propargylic alcohols with CF<SUB>3</SUB>I in the presence of Ru(bpy)<SUB>3</SUB>Cl<SUB>2</SUB> as the photocatalyst followed by double‐bond migration/keto‐enol tautomerization provides β‐trifluoromethyl ketones as the final product.</P>
Visible‐Light‐Promoted Synthesis of Benzimidazoles
Park, Sehyun,Jung, Jaehun,Cho, Eun Jin WILEY‐VCH Verlag 2014 EUROPEAN JOURNAL OF ORGANIC CHEMISTRY Vol.2014 No.19
<P><B>Abstract</B></P><P>A simple and environmentally‐friendly synthetic method for benzimidazoles, which are important structural motifs in many applications owing to their various biological functions, has been developed. The reaction of <I>o</I>‐phenylenediamine and a variety of aliphatic/aromatic aldehydes in methanol proceeds at room temperature with only natural sources, molecular oxygen and visible light.</P>